@Freak-bg: the steps Neotalk outlined are good but I am confused. You wrote that you reflashed (incl. emmc) and no luck and also mentioned that you o-c (with titan? kernel) but using default freq still made no difference.

Did you test camera after reflashing but before installing the power kernel?

If you follow neotalk's 2nd post and, using an "out of the box" setup, the camera does not work then there is nothing that can be done from a software pov. That USB repair job potentially may be implicated.

You can also try the following in a terminal. Using gstreamer, and with the camera cover open, it should bring up a feed to the n900's screen. If that does not work then refer my comments above....